Final answer:
The information provided does not include the full title of the Estate Agents Act 1980. Instead, it references the repeal of a different Act concerning stamp duties in 1766. To find the full title of the Estate Agents Act 1980, one should consult official legal resources or databases.
Step-by-step explanation:
The full title of the legislation referred to in the Estate Agents Act 1980 is not provided within the information given. The excerpt presented seems to refer to a historic Act from the year 1766, concerning stamp duties, which is unrelated to the Estate Agents Act 1980. It's important to note that while the given text speaks of an Act being repealed in 1766, the Estate Agents Act 1980 would have a different title and content, associated with the regulation of estate agency work within the UK.
The proper approach to finding the full title of the Estate Agents Act 1980 would be to look into legal databases or the official legislation resources provided by the government, which typically contains comprehensive details of active legislative documents.